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Category:   Device (Encryption/VPN)  >   Citrix NetScaler Vendors:   Citrix
(Citrix Issues Fix for Citrix NetScaler Service Delivery Appliance) Xen QEMU PCI Comman Register Access Lets Local Guest Users Deny Service on the Host System
SecurityTracker Alert ID:  1036515
SecurityTracker URL:  http://securitytracker.com/id/1036515
CVE Reference:   CVE-2015-2756   (Links to External Site)
Date:  Aug 3 2016
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 10.1.x prior to version 10.1 Build 133.9; 10.5.x prior to versions 10.5 Build 58.11 and 10.5 Build 57.7005.e
Description:   A vulnerability was reported in Xen. A local user on the guest system can cause denial of service conditions on the target host system. Citrix NetScaler Service Delivery Appliance is affected.

A local user on an HVM guest system can modify the PCI command register of a device passed through to the guest to trigger unsupported request responses that, in certain cases, may cause the host system to crash.

Only x86 systems are affected.

ARM systems are not affected.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local user on the guest system can cause the target host system to crash.
Solution:   Citrix has issued a fix for CVE-2015-2756 for Citrix NetScaler Service Delivery Appliance (10.1 Build 133.9, 10.5 Build 58.11, 10.5.e Build 57.7005.e).

Version 11.0 is not affected.

The Citrix advisory is available at:

http://support.citrix.com/article/CTX206006

Vendor URL:  support.citrix.com/article/CTX206006 (Links to External Site)
Cause:   State error

Message History:   This archive entry is a follow-up to the message listed below.
Apr 1 2015 Xen QEMU PCI Comman Register Access Lets Local Guest Users Deny Service on the Host System



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